Method and apparatus for forming tearing-strip cans



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G. F. WALTER I METHOD AND APPARATUS FOR FORMING TEARING STRIP CANS FiledNov 1, 1926 2 Sheets-Sheet 2 mum" WmvENfbR m 351mm BM L441,

30 simultaneously with the bumpin Patented Jan. 8}1929.

, UN-lTED ST-ATES 1,698,285 PATENT. OFFICE.

GEORGE FREDRICK WALTER, OF BROOKLYN, NEW YORK, ASSIGN OR TO AMERICAN CANI COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

METEOR AND APPARATUS FOR FORMNG 'TEARING-STRIP CAN Application fieldNovember 1,1926. Serial No. 145,4ie.

This invention relates in general to a method and apparatus for forminginteriorly beaded cans and has for an object the provision of a methodand apparatus for forming such cans that will be reliable, that willform substantially perfect cans or cans that do not have leaks at theseam such as may be caused by displacement of the overlapped parts. Anyone skilled in the can maklng art knows that it is not practical to forma beadin a can until the can is fully formed, side seamed and soldered,and that when a can is fully beaded after forming or bending the metalto form, the seam is materially stretched and compressed particularly atthe seam and that .for this reason in cans so formed and where the beadrequires extensive forming the soldered joint is frequently broken whichpermits the can to leak, or de- 2 stroys the can.

An important object of the present inven-,

tion is to eliminate this diffic'ulty, by providing an important andpreliminary operation that will form a portion of the bead or partly 2form the bead before the seam is soldered so that the displacement ofthe metal at the crossing of the seam and head will not besufiicient tocause the soldered joint to break and a method of applying such anoperation or seamlocking operation so that no additlonal operations willbe required. To accomplish this the can body is formed by bending orrollin a notched can body blank to true 0 lindrica or other shape uponthe mandrel of the body maker hooking two edges of the blank toy Ygether in the usual manner to form the lock and lap seam, and bumpingthe seam along the length thereof to secure the lock seam,

with a hammer or bumper adapted to form a r recess or indentationpreferably in and across the lap seam at the point which is to be theintersection of theseam and bead at the point where the desired beadwill cross the seam,

t'opartly form a. portion of the-desired bead or the portion t of thatcrosses the seam, then soldering the' am to secure the ends of the blankand complete the seam, and forming the remainder of the beadorcompleting the bead in suitable die mechanism.

Numerous'other objects and advantages of the invention will be apparentas it .is better understood from the following description, which, takenin connectionwith the accompanying drawings, discloses a preferredembodiment thereof.

Referring to the drawings I Fig. 1 is a perspective view of aniriteriorly beaded can embodying my invention and partly broken away toshow details of con struction;

Fig. 2 is aside elevational view of a can body blank positioned on thehorn. of the body maker and above the bumping hammer or at the bumping"station, a portion of the can body and body maker horn being broken awayto show details of construction; I

Fig. 3 is a view similar to Fig. 2 showin the can body after the-seam iscomplete an passing over a solder roll;

Fig. 4v is a partly broken away view of the can body positioned within abeading device and partly in section "and W Fig. 5 shows the. body afterthe "beading operation and showing the wall of the can collapsed to forma portion of the bead.

To illustrate my invention I have shown a hollow container body 10 ofcylindrical or other form, provided with the usual lock and lap sideseam, thelock part of the side seam being indicated by numeral 11, thelower" lapped part by numeral 12 and. the upper lapped part ,by numeral13. Circumferem tially parallel score lines 14 set off a'tearing strip15 which is further provided with auxiliary or directing score lines 16.The said tearing strip 15 terminates in the tongue 17 which extendsbeyond the lapped portion 13 of the said side seam. The container isprovided with a bottom member 18 and a cover member 19 preferably doubleseamed to the container body. The said cover member 19 is provided witha counter-sink 2O inwardly spaced froma the interior wall of thecontainer when the cover member is se-' cured t6 the can bodywall by theregular double seam 21x The can body wall just below the tearing stripis pressed inwardly at 22 to form an upwardly and inwardly-extendingloop or head 23. The inner diameter of the loop portion 23 is correctlysized to securely engage the outer diameter of the counter-sink 20 afterthe tearing strip is removed and when the cover member 19 is used as afriction .plug reclosure for the opened container 10: r

Referring now to Fig. 2 which illustrates the gist of the invention, apartially shown bumping hammer 24 with bumping straight edge 25 and aheading ridge or projection 26 is illustrated asjust having bumped thelook part 11 of the side seam which comprises four .hicknesses of metal,and having depressed into. an inward head the lapped part 13 of the sideseam which comprises two thicknesses of metal. The cam body 10 isbrought to this bumping and pre-beading station upon a mandrel or horn27 by feeding devices 28, and said mandrel or horn has a recess 29corresponding in size and contour to the heading projection 26 of thehammer, the said recesses 29 and the said projection 26 co-operating topro- ,duce the pro-bead, indent 'or depression 30,

also clearly illustrated in Fig. 4.. From said prebeading and bumpingstation, the container body 10 is fed in the same direction by a chainconveyer 31 having feeding dogs"32 which on age the rear edge of thebody cylinderan propel it between guide rails 33 or a so-called outsidesolder horse, over the solder bath where a solder roll 34 of a wellknown type and construction revolves in said solder bath and projects orthrows molten solder into the open spaces of the can body side seam, andalso between-the lapped prebeaded or recessed part 30 of the'side seam,the entire side seam having been previously fiuxed and the flux actin todrawthe solder by ca illary attraction into the side seam partsincluding the depression 30, unitin said pre-beaded lapsin a permanentsolder oint, which, as has been found in the practice of my invention,will easily withstand, without breaking, the subsequent final beadin andcolapsing operation illustrated in Figs. 4 an 5.

Fig. 4 shows the. can body 10 acted upon by 'an inner beading roller 35and an outer ring die 36 with an inwardl extended annular bearing ridgeor projection 37 which co-opcrates with the annular groove 38 of thebeads ing roller 35 to produce the complete annular bead 39..-

After the annular bead 39 has been formed,

the can body is subjected to a collapsing die 40 and a sizing die 41which in co-operation It is thought that the invention and many of itsattendant advantages will be understood from the foregoing description,and it will be apparent that various changes may be made inthe form,construction and arrangement of the parts without departing from thespirit and scope of the invention, or sacrificing all of its materialadvantages, the form hereinbefore described being merely a preferredembodiment thereof.

I claim:

1. The method of making cans havin interlocked or lapped side seams andencircling beads in the dies'thereof, which consists in forming thebody, interlocking the side seam,

bumping the side seam and at the same operation indenting the side seam,soldering the closed side seam and then forming an am circling head inthe body of the can that Will-.

intercept the said indentation and make it a" part of said bead. 1

2. The method of making cans having side intercept the said indent andmake it a part i of said bead.

3. The method of progressively forming beads in can bodies,which'consists in forming a cylindrical can body with a side seam, indenting the side seams, sealin the side seam, then forming the remainder0% the indent as a art. thereof.

beads in can bodies, which consists in form'- ing a cylindrical can bodywith a side seam,

forming a portion of an encircling bead across said side seam, sealingsaid side seam and then com leting the formation of the encircling bead5. An apparatus for forming a cylindrical can body having a side seam,comprising, means for closing said seam and formingan indent therein,means for sealing said seam and means for then, forming an encirclinghead in said body located to intercept the indent previously made insaid side seam whereby said indent forms a part of said bead.

6. In apparatus for making beaded containers, the combination of meansfor forming a side seamed container, means for bumping said side seam,means integral with said bumping means for prebending part of said sideseam and means for completing said prebend into a peripheral bead.

7. The method of heading a container body having a side seam, whichconsists in formin a container body, prebending part of sai containerbody which has more than onein the seam forming operation, solderin thegrim; and then forming the remainder o the 10. A method of formingbeaded lock seam cans, which consists in interruptingthe lock the beadusing 4. The metho of progressively formingart of said side seam, I

cans having soldered side seams, which consists 1n partly forming aportion of the bead seam and substituting a lap seam therefor throughoutthe area interrupted by the bead, forming the seam andpartly forming apor tion of the bead simultaneously, soldering the seam and thencompleting the formation of the bead.

11. An apparatus for forming beaded lock and lap seam cans,v comprising,means for forming a can having a side seam a portion ing the bead afterthe seam has been sealed by means of solder or the like.

GEORGE FREDRICK WALTER.

